Division III Definition of a sub-plot

In principle all trees in the total plot are to be included in the sample for the tree assessments (e.g. crown inventory, increment assessment). In the case that the plot has many trees (i.e. dense stands), a sub-plot may be defined to be used for these surveys. The size of the sub-plot at the time of the installation of the plot should be large enough to give reliable estimates for these surveys for a minimum of 20 years, preferably throughout the life of the stand. A minimum of at least 20 trees in the sub-plot should be available in this period.